LT1780 Datasheet | Linear Technology

LT1780/LT1781 Low Power 5V RS232 Dual Driver/Receiver with ±15k V ESD Protection DESCRIPTIO The LT®1780/LT1781 are dual RS232 driver/receiver pairs with integral charge pump to generate RS232 voltage levels from a single 5V supply. Using only 0.1µF external capacitors, these circuits consume only 40m W of power, and can operate to 120kbaud even while driving heavy capacitive loads. New ESD structures on the chip allow the LT1780/LT1781 to survive ±15k V air gap and ±8k V contact ESD tests per IEC 1000-4-2, eliminating the need for costly Trans Zorbs® on the RS232 line pins. The LT1780/ LT1781 are fully pliant with EIA RS232 standards. Driver outputs are protected from overload, and can be shorted to ground or up to ± 30V without damage. During SHUTDOWN or power-off conditions, driver and receiver outputs are in a high impedance state, allowing line sharing. The LT1780/LT1781 are direct upgrades to the LT1180A/ LT1181A, LT1280A/LT1281A and LT1381 for applications which require the utmost ESD protection. The LT1781 is available in 16-pin DIP,SO and SW packages. The LT1780 is supplied in 18-pin DIP and SW packages for applications which require SHUTDOWN. , LTC and LT are registered trademarks of Linear Technology Corporation. Trans Zorb is a registered trademark of General Instruments, GSI. Features s s s s s s s s s s s s s 10m A Max Supply Current ESD Protection to IEC 1000-4-2 Level 4 ±15k V Air Gap, ±8k V Contact Uses Small Capacitors: 0.1µF 120k Baud Operation for RL = 3k, CL = 2500p F 250k Baud Operation for RL = 3k, CL = 1000p F Outputs Withstand ± 30V Without Damage CMOS parable Low Power: 40m W Operates from a Single 5V Supply Rugged Bipolar Design Outputs Assume a High Impedance State When Off or Powered Down Meets All RS232 Specifications Available With or Without Shutdown Absolutely No Latch-up APPLICATI s s s s s Portable puters Battery-Powered Systems Power Supply Generator Terminals Modems TYPICAL APPLICATI 2 0.1µF 4 LT1780 5 0.1µF 6 12 LOGIC...